CVE-2026-85721

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{"bugzilla": {"description": "org.asynchttpclient/async-http-client: AsyncHttpClient: Denial of Service via unbounded HTTP response decompression", "id": "2536136", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2536136"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-770", "details": ["The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. From 2.0.0 until 2.16.1 and 3.0.12, automatic response decompression on the HTTP/1.1 path uses ChannelManager.newHttpContentDecompressor() to install Http1ContentDecompressor without a cumulative output-size limit. A hostile or compromised server, or an attacker who can alter a response in transit, can send a small gzip, deflate, or snappy response that expands across chunks until the client exhausts its heap and raises OutOfMemoryError; brotli and zstd are also affected when their optional codecs are present. In versions 3.0.8 through 3.0.10, the HTTP/2 decompressor is also unbounded, so switching protocols does not mitigate the issue on those releases. A limit applied to each decode call is insufficient because the response can be delivered as many small chunks, so the fixed implementation tracks total decompressed bytes for the whole response. This issue is fixed in versions 2.16.1 and 3.0.12.", "A flaw was found in the AsyncHttpClient (AHC) library. A remote attacker, by sending a specially crafted, small compressed HTTP response, could exploit a vulnerability in the automatic response decompression mechanism. This flaw, caused by the lack of a cumulative output-size limit, allows the compressed response to expand excessively, leading to the client exhausting its memory and resulting in a denial of service."], "name": "CVE-2026-85721", "package_state": [{"cpe": "cpe:/a:redhat:jboss_fuse:7", "fix_state": "Affected", "package_name": "async-http-client", "product_name": "Red Hat Fuse 7"}], "public_date": "2026-09-17T15:55:32Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-85721\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-85721\nhttps://github.com/AsyncHttpClient/async-http-client/commit/5ee2841cbf268bba4a200578be3938ccfc6cc6d6\nhttps://github.com/AsyncHttpClient/async-http-client/commit/663a1a91757904b22cfe37e2e6049f1f8ea6ae59\nhttps://github.com/AsyncHttpClient/async-http-client/commit/e1871a19972fb496be1b8ac6be11d79e22ff2162\nhttps://github.com/AsyncHttpClient/async-http-client/commit/e9f2f7423e0f6503f529656f2955a1317e56ba14\nhttps://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-7grg-jcf7-rpmx"], "threat_severity": "Important"}

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